package io.github.dunwu.javacore.jdk8.concurrent;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.atomic.LongAdder;
import java.util.stream.IntStream;

/**
 * @author Benjamin Winterberg
 */
public class LongAdder1 {

	private static final int NUM_INCREMENTS = 10000;

	private static LongAdder adder = new LongAdder();

	public static void main(String[] args) {
		testIncrement();
		testAdd();
	}

	private static void testIncrement() {
		ExecutorService executor = Executors.newFixedThreadPool(2);

		IntStream.range(0, NUM_INCREMENTS).forEach(i -> executor.submit(adder::increment));

		ConcurrentUtils.stop(executor);

		System.out.format("Increment: Expected=%d; Is=%d\n", NUM_INCREMENTS, adder.sumThenReset());
	}

	private static void testAdd() {
		ExecutorService executor = Executors.newFixedThreadPool(2);

		IntStream.range(0, NUM_INCREMENTS).forEach(i -> executor.submit(() -> adder.add(2)));

		ConcurrentUtils.stop(executor);

		System.out.format("Add: %d\n", adder.sumThenReset());
	}

}
